We decided not to rely on existing compilations of known variables (as for
example collected in the
VSXhttp://vizier.u-strasbg.fr/viz-bin/VizieR-3?-source=B/vsx/
catalog), because the adopted classification criteria (as well as amplitude
and periods) are sometimes in disagreement among themselves and also
in conflict with the naming conventions listed in the IAU General Catalog of
Variable Starshttp://www.sai.msu.su/gcvs/. We preferred instead
to analyze in a homogeneous way their photometric behavior ourselves. To
this aim we downloaded the available photometry for the 83-sample from the
ASAS-SN sky patrol survey [1]}, [2]} and
examine ourselves the resulting lightcurves, which are usually composed of
hundreds of individual observations in either \(g\)  or \(V\)  bands distributed
over a time-interval of a few years, and therefore adequate to reveal the
presence of long and stable periodicities related to radial pulsation.
ASAS-SN sky patrol covers the whole accessible sky on both hemispheres every
night, and the \(12 < V_{JK} < 14\)  mag range of our targets is ideally placed
at the center of ASAS-SN dynamic range, away from the bright saturation
limit or the noisy detection threshold.
